The most likely author of Jeremiah 17:9-10 is the prophet Jeremiah himself. Jeremiah was a key figure in the Old Testament, known for his prophecies and messages of warning and repentance to the people of Israel. He is traditionally credited with writing the Book of Jeremiah, which contains his prophecies and messages from God.

Evangelical Christians believe that the Bible is the inspired, inerrant Word of God, and that the words written by the biblical authors are guided by the Holy Spirit. Therefore, they see Jeremiah as a vessel through which God communicated His message to His people.

In Jeremiah 17:9-10, the prophet delivers a message about the condition of the human heart and the need for trust in the Lord. It reads:

“The heart is deceitful above all things
and beyond cure.
Who can understand it?

‘I the Lord search the heart
and examine the mind,
to reward each person according to their conduct,
according to what their deeds deserve.’”

Evangelical Christians view these verses as a reminder of the fallen nature of humanity and the importance of trusting in God for guidance and salvation. They see Jeremiah as a faithful servant of God who faithfully proclaimed God’s message, even in the face of opposition and persecution.